What if the next strategic source of rare earths is not underground, but sitting in obsolete phones, hard drives, aircraft parts, and industrial waste? That question is gaining weight as the United States tries to reduce its dependence on foreign rare earth supply chains. These 17 elements are essential to the magnets, optics, catalysts, motors, and electronics that underpin consumer devices, energy systems, and advanced manufacturing. They are not especially rare in the Earth’s crust, but economically recoverable deposits are difficult to find and even harder to process. That difficulty has helped China dominate refining and magnet production, leaving U.S. industry exposed at the stages that matter most.
Julie Klinger of the University of Wisconsin–Madison has argued that the overlooked stockpile is already above ground. “Less than 1% of the rare earths that we consume are recycled,” she said. “That means we’ve been accumulating rare earths in our waste for decades.” The engineering case for recovery is straightforward, even if the chemistry is not. Rare earths are embedded in tiny quantities across modern products, which makes collection and separation expensive. Smartphones, speakers, hard drives, electric motors, and vehicle systems all contain them, but usually in concentrations too low for simple disassembly to be enough.
Recovering them often requires precision sorting, aggressive solvents, or carefully controlled refining steps. Yet the payoff is substantial: recycling can cut reliance on new mines, reduce waste streams, and turn end-of-life products into feedstock for domestic industry. In magnets, the opportunity is especially large because neodymium-iron-boron materials are among the biggest users of rare earth elements and can contain roughly 30% rare earth content by weight in some applications.
Some of the most important progress is happening at the process level. Oak Ridge National Laboratory said its membrane-based method for scrapped magnets recovers more than 97% of the rare earth elements, producing oxides with purity above 99.5%. Other work has focused on lower-impact extraction routes, including copper-salt methods and robotic disassembly systems that target the exact parts where magnets are concentrated instead of shredding whole devices. That shift from bulk waste handling to precision recovery matters.
Apple’s disassembly systems are one example of how “urban mining” is being industrialized. The company’s Daisy robot can take apart iPhones and isolate components that conventional recycling tends to miss, while its partnership with MP Materials is aimed at sending recovered magnet material back into U.S. processing. Apple has said its magnets now use 99% recycled rare earth elements, a sign that closed-loop recovery is moving from pilot concept to manufacturing input.
The wider supply chain is also being rebuilt around those recovered materials. MP Materials remains the country’s only active large-scale rare earth mine, but downstream capacity has become just as important. In Ohio, REalloys has described itself as the only operating heavy rare-earth metallization capability in North America, highlighting a bottleneck between oxide separation and finished magnet production. Meanwhile, the Department of Energy has funded projects that extract rare earths from coal byproducts and acid mine drainage, including $17.5 million for four processing projects aimed at unconventional domestic sources.
The larger point is that waste is no longer being treated only as a disposal problem. Electronic scrap, mining residues, coal ash, and retired machinery are increasingly being treated as engineered inventories of critical materials. Klinger summarized the shift plainly: “I think that we don’t need to dig new holes in the ground to get the material that we need because it’s all around us, currently misrecognized as waste.”
